<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>05_继承属性和自己属性</title>
    <style>
        .parent {
            font-size: 40px !important;
        }

        .son {
            font-size: 18px;
        }
    </style>
</head>

<body>
    <div class="parent">
        我是父元素
        <span class="son">我是子元素</span>
    </div>
</body>

</html>